IAS Mains Geology Papers 1986
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IAS Mains Geology 1986
Paper I
Section A
- Answer any three of the following in about 200 words each
- Earths planetary dynamics in relation to Ice Age
- Radiocarbon dating
- Atolls
- Kinematic axis
- Explain foliations and lineations observed in the geological bodies and interpret their different orientations.
- What is a geosyneline? Explain the basis on which geosynelines are classified. Write Keys classification of geosynelines.
- Comment on the major relief features of Indian Ocean and briefly discuss their origin.
Section B
- Answer any three of the following in about 200 words each
- Evolution of Man
- Morphology and adoptations of bivalves
- Age of Deccan Traps
- Permian Triassic Boundary
- What are the criteria which can be used for correlation of the Archean rocks of Peninsular India?
- Discuss the classification. And age of the Gondwana Super Group of India and correlate them with similar formations of South Africa, Australia and South America.
- Discuss briefly the morphology of trilobites with suitable sketches. How are the trilobites useful for stratigraphic correlation? Name six important trilobites of India.
Paper II
Section A
- Explain any three of the following in about 200 words each:
- Optical indicatrices
- Barrovian Zones of metamorphism
- Magmatic differentiation
- Heavy minerals and their significance
- Explain the derivation of 32 classes of crystal symmetry.
- Give an account of the physical, chemical and optical properties of the Feldspar group of minerals with special emphasis on their variations with chemical compositions.
- Discuss critically the statement that there are chamockites and chamockites.
Section B
- Write explanatory notes on any three of the following in about 200 words each
- Placer deposits
- Metallogenetic spochs
- Mineral benefication
- Soil types of India
- Explain in detail the various controls that localise mineral deposits giving examples.
- Explain how photogeological studies are useful in exploration work.
- Describe the important Manganese deposits of India with reference to their mineralogy and geological setting. Explain their origin.